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首页> 外文期刊>Ocean Dynamics >Simulation of annual biogeochemical cycles of nutrient balance, phytoplankton bloom(s), and DO in Puget Sound using an unstructured grid model
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Simulation of annual biogeochemical cycles of nutrient balance, phytoplankton bloom(s), and DO in Puget Sound using an unstructured grid model

机译：使用非结构网格模型模拟普吉特海湾养分平衡，浮游植物水华和溶解氧的年度生物地球化学循环

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Nutrient pollution from rivers, nonpoint source runoff, and nearly 100 wastewater discharges is a potential threat to the ecological health of Puget Sound with evidence of hypoxia in some basins. However, the relative contribu tions of loads entering Puget Sound from natural and an thropogenic sources, and the effects of exchange flow from the Pacific Ocean are not well understood. Development of a quantitative model of Puget Sound is thus presented to help improve our understanding of the annual biogeochem ical cycles in this system using the unstructured grid Finite-Volume Coastal Ocean Model framework and the Integrated Compartment Model (CE-QUAL-ICM) water quality kinet ics. Results based on 2006 data show that phytoplankton growth and die-off, succession between two species of al gae, nutrient dynamics, and dissolved oxygen in Puget Sound are strongly tied to seasonal variation of temperature, solar radiation, and the annual exchange and flushing in duced by upwelled Pacific Ocean waters. Concentrations in the mixed outflow surface layer occupying approximately 5-20 m of the upper water column show strong effects of eutrophication from natural and anthropogenic sources, spring and summer algae blooms, accompanied by depleted nutrients but high dissolved oxygen levels. The bottom layer reflects dissolved oxygen and nutrient concentrations of upwelled Pacific Ocean water modulated by mixing with biologically active surface outflow in the Strait of Juan de Fuca prior to entering Puget Sound over the Admiralty Inlet. The effect of reflux mixing at the Admiralty Inlet sill result ing in lower nutrient and higher dissolved oxygen levels in bottom waters of Puget Sound than the incoming upwelled Pacific Ocean water is reproduced. By late winter, with the reduction in algal activity, water column constituents of interest, were renewed and the system appeared to reset with cooler temperature, higher nutrient, and higher dissolved oxygen waters from the Pacific Ocean.
机译：来自河流的养分污染，非点源径流和近100个废水排放对普吉特海湾的生态健康构成潜在威胁，某些盆地存在缺氧迹象。但是，人们对从自然和人为来源进入普吉特海湾的货物的相对贡献以及来自太平洋的交换水流的影响还知之甚少。因此，提出利用非结构化网格有限体积沿海海洋模型框架和综合隔层模型（CE-QUAL-ICM）水质来发展普吉特海湾量化模型，以帮助增进我们对该系统中年度生物地球化学循环的理解。动力学基于2006年数据的结果表明，普吉特湾浮游植物的生长和死亡，两种藻类之间的演替，养分动态和溶解氧与温度，太阳辐射的季节性变化以及该岛的年度交换和冲洗密切相关。由上升的太平洋水域引起。混合出水表层的浓度约占上水柱的5-20 m，显示出自然和人为来源的富营养化的强烈影响，春季和夏季的藻类大量繁殖，营养物质枯竭但溶解氧含量高。最底层反映了上升的太平洋海水的溶解氧和营养物浓度，该浓度是通过与胡安·德·富卡海峡中具有生物活性的地表水混合后调节的，然后才进入金钟湾上的普吉特海湾。在金钟入口基石上的回流混合的作用导致与重复上升的太平洋上升水相比，普吉特海湾底部水域的营养成分较低，溶解氧含量较高。到冬季末，随着藻类活动的减少，感兴趣的水柱成分被更新，并且该系统似乎随着来自太平洋的温度降低，养分含量更高和溶解氧含量更高而重置。

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